18687361218 has 32 divisors (see below), whose sum is σ = 39950934912. Its totient is φ = 5812963200.

The previous prime is 18687361201. The next prime is 18687361267. The reversal of 18687361218 is 81216378681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1645753 + ... + 1657068.

It is an arithmetic number, because the mean of its divisors is an integer number (1248466716).

Almost surely, 2^18687361218 is an apocalyptic number.

18687361218 is an abundant number, since it is smaller than the sum of its proper divisors (21263573694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18687361218 is a wasteful number, since it uses less digits than its factorization.

18687361218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302890.

The product of its digits is 774144, while the sum is 51.

The spelling of 18687361218 in words is "eighteen billion, six hundred eighty-seven million, three hundred sixty-one thousand, two hundred eighteen".